| 摘要 |
PURPOSE:To discharge efficiently ozone or the like generated by discharge to prevent foreign matters from sticking to a discharging member by providing a discharge aperture part in a shield member and providing an air inflow port. CONSTITUTION:A very narrow corona discharging wire 2 connected to a DC high-voltage power source 1 is stretched, and a body 3 to be electrified as an electric charge acceptor is provided in the position facing the wire 2, and they are so constituted that corona discharge occurs. An air inflow port 6 is provided on a shield member 4, and the inflow port 6 is provided with a air duct 7, and a blast fan 8 is provided in the end part of the air duct 7 to constitute a forcible ventilating means. When a wind is blown forcibly, a part w1 of the wind is flowed out from the gap between the shield member 4 and the body 3 to be electrified to prevent penetration of external floating foreign matters. Though some of foreign matters 9 like toner stuck onto the body 3 to be electrified whirl up by the on current, they are carried along the shield side wall by a wind w2 transmitted on the side wall of the shield member 4 and are discharged from a discharge aperture part 5, and foreign matters 9 are not stuck to the corona discharging wire 2. |
